sen5x.h

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#pragma once
 
#include "esphome/core/component.h"
#include "esphome/components/sensor/sensor.h"
#include "esphome/components/sensirion_common/i2c_sensirion.h"
#include "esphome/core/application.h"
#include "esphome/core/preferences.h"
 
namespace esphome {
namespace sen5x {
 
enum ERRORCODE : uint8_t {
  COMMUNICATION_FAILED,
  SERIAL_NUMBER_IDENTIFICATION_FAILED,
  MEASUREMENT_INIT_FAILED,
  PRODUCT_NAME_FAILED,
  FIRMWARE_FAILED,
  UNKNOWN
};
 
enum RhtAccelerationMode : uint16_t {
  LOW_ACCELERATION = 0,
  MEDIUM_ACCELERATION = 1,
  HIGH_ACCELERATION = 2,
};
 
enum class Sen5xType : uint8_t { SEN50, SEN54, SEN55, UNKNOWN };
 
struct GasTuning {
  uint16_t index_offset;
  uint16_t learning_time_offset_hours;
  uint16_t learning_time_gain_hours;
  uint16_t gating_max_duration_minutes;
  uint16_t std_initial;
  uint16_t gain_factor;
};
 
struct TemperatureCompensation {
  int16_t offset;
  int16_t normalized_offset_slope;
  uint16_t time_constant;
};
 
// Shortest time interval of 2H (in milliseconds) for storing baseline values.
// Prevents wear of the flash because of too many write operations
static const uint32_t SHORTEST_BASELINE_STORE_INTERVAL = 2 * 60 * 60 * 1000;
 
class SEN5XComponent : public PollingComponent, public sensirion_common::SensirionI2CDevice {
 public:
  void setup() override;
  void dump_config() override;
  void update() override;
 
  void set_pm_1_0_sensor(sensor::Sensor *pm_1_0) { this->pm_1_0_sensor_ = pm_1_0; }
  void set_pm_2_5_sensor(sensor::Sensor *pm_2_5) { this->pm_2_5_sensor_ = pm_2_5; }
  void set_pm_4_0_sensor(sensor::Sensor *pm_4_0) { this->pm_4_0_sensor_ = pm_4_0; }
  void set_pm_10_0_sensor(sensor::Sensor *pm_10_0) { this->pm_10_0_sensor_ = pm_10_0; }
 
  void set_voc_sensor(sensor::Sensor *voc_sensor) { this->voc_sensor_ = voc_sensor; }
  void set_nox_sensor(sensor::Sensor *nox_sensor) { this->nox_sensor_ = nox_sensor; }
  void set_humidity_sensor(sensor::Sensor *humidity_sensor) { this->humidity_sensor_ = humidity_sensor; }
  void set_temperature_sensor(sensor::Sensor *temperature_sensor) { this->temperature_sensor_ = temperature_sensor; }
  void set_store_baseline(bool store_baseline) { this->store_baseline_ = store_baseline; }
  void set_acceleration_mode(RhtAccelerationMode mode) { this->acceleration_mode_ = mode; }
  void set_auto_cleaning_interval(uint32_t auto_cleaning_interval) {
    this->auto_cleaning_interval_ = auto_cleaning_interval;
  }
  void set_voc_algorithm_tuning(uint16_t index_offset, uint16_t learning_time_offset_hours,
                                uint16_t learning_time_gain_hours, uint16_t gating_max_duration_minutes,
                                uint16_t std_initial, uint16_t gain_factor) {
    GasTuning tuning_params;
    tuning_params.index_offset = index_offset;
    tuning_params.learning_time_offset_hours = learning_time_offset_hours;
    tuning_params.learning_time_gain_hours = learning_time_gain_hours;
    tuning_params.gating_max_duration_minutes = gating_max_duration_minutes;
    tuning_params.std_initial = std_initial;
    tuning_params.gain_factor = gain_factor;
    this->voc_tuning_params_ = tuning_params;
  }
  void set_nox_algorithm_tuning(uint16_t index_offset, uint16_t learning_time_offset_hours,
                                uint16_t learning_time_gain_hours, uint16_t gating_max_duration_minutes,
                                uint16_t gain_factor) {
    GasTuning tuning_params;
    tuning_params.index_offset = index_offset;
    tuning_params.learning_time_offset_hours = learning_time_offset_hours;
    tuning_params.learning_time_gain_hours = learning_time_gain_hours;
    tuning_params.gating_max_duration_minutes = gating_max_duration_minutes;
    tuning_params.std_initial = 50;
    tuning_params.gain_factor = gain_factor;
    this->nox_tuning_params_ = tuning_params;
  }
  void set_temperature_compensation(float offset, float normalized_offset_slope, uint16_t time_constant) {
    TemperatureCompensation temp_comp;
    temp_comp.offset = offset * 200;
    temp_comp.normalized_offset_slope = normalized_offset_slope * 10000;
    temp_comp.time_constant = time_constant;
    this->temperature_compensation_ = temp_comp;
  }
  bool start_fan_cleaning();
 
 protected:
  bool write_tuning_parameters_(uint16_t i2c_command, const GasTuning &tuning);
  bool write_temperature_compensation_(const TemperatureCompensation &compensation);
 
  char serial_number_[17] = "UNKNOWN";
  uint16_t voc_baseline_state_[4]{0};
  uint32_t voc_baseline_time_;
  uint16_t firmware_version_;
  Sen5xType type_{Sen5xType::UNKNOWN};
  ERRORCODE error_code_;
  bool initialized_{false};
  bool store_baseline_;
 
  sensor::Sensor *pm_1_0_sensor_{nullptr};
  sensor::Sensor *pm_2_5_sensor_{nullptr};
  sensor::Sensor *pm_4_0_sensor_{nullptr};
  sensor::Sensor *pm_10_0_sensor_{nullptr};
  // SEN54 and SEN55 only
  sensor::Sensor *temperature_sensor_{nullptr};
  sensor::Sensor *humidity_sensor_{nullptr};
  sensor::Sensor *voc_sensor_{nullptr};
  // SEN55 only
  sensor::Sensor *nox_sensor_{nullptr};
 
  optional<RhtAccelerationMode> acceleration_mode_;
  optional<uint32_t> auto_cleaning_interval_;
  optional<GasTuning> voc_tuning_params_;
  optional<GasTuning> nox_tuning_params_;
  optional<TemperatureCompensation> temperature_compensation_;
  ESPPreferenceObject pref_;
};
 
}  // namespace sen5x
}  // namespace esphome